TW201938899A - Shield tail clearance measuring device and shield shell capable of preventing a base portion from protrusion out of an inner peripheral surface of the shield - Google Patents

Abstract

A shield tail clearance measuring device (10) of the present invention includes a base portion (16), a rotating shaft portion (17) supported by the base portion (16), a rotation angle sensor (18), a hand contact portion (19) integrally joined with the rotating shaft portion (17), and a rotating elastic pushing mechanism (20) for providing a rotating elastic force to the hand contact portion (19). The rotating elastic pushing mechanism (20) includes a reversing mechanism (20a) for releasing the rotating elastic force to rotate the rotating shaft portion (17) in an opposite direction, and is configured to rotate the rotating shaft portion (17) in a manner of rotating the hand contact portion (19) toward the opposite side of the central axis of the shield shell (12), so as to accommodate the contact hand portion in the height range of the base portion (16).

Description

Shield tail gap measuring device and shield shell

The present invention relates to a shield tail gap measuring device and a shield shell for measuring a shield tail gap between a shield case held by a submersible shield machine and an outer peripheral surface of a ring piece assembled at a rear portion of the shield case.

The submersible shield construction method is as follows: while using earth, mud water, gas, etc. to press against the cutting end face of the submersible shield machine, the cutter is used to dig the foundation, and the tunnel lining body composed of rings is assembled behind the submersible shield machine. One side forms a tunnel in the ground from the starting shaft to the ending shaft; this process is widely used as the main tunnel engineering process for urban or plain areas. The submersible shield machine used for the submersible shield construction method is a rotary cutter, or partition, cutter driving device, earth discharging mechanism, etc., which is provided with a cutting and digging surface at the front of a metal outer casing called a shield shell, and is used in the shield. The rear part of the shell is equipped with a pushing jack and a mounting device. The mounting device is used to assemble a tunnel lining body composed of ring pieces. The self-assembled tunnel lining body obtains a reaction force, and the shield shell and the rotary cutter are pushed together by the pushing jack. The tunnel is cut while cutting the digging surface. In addition, a gap called a shield tail gap is maintained between the outer peripheral surface of the assembled tunnel lining body and the inner peripheral surface of the shield shell covering the rear part of the tunnel lining body. The shield shell can be smoothly moved forward along the outer peripheral surface of the tunnel lining body while the tunnel lining body is retained. During the construction of the curved part, the remaining gap can be used to gradually make the shield shell relative to the tunnel lining body. Move in a curved direction. Furthermore, in order to prevent earth, sand or groundwater from flowing into the submersible shield from the surrounding site through the shield tail gap, a tail seal made of, for example, a flexible ring-shaped member at the shield tail gap is used in the tunnel lining and the shield. A plurality of shells are mounted at intervals in the axial direction. On the other hand, in this type of submersible shield machine, it is important to measure the quality of the tunnel lining body in order to prevent deformation or damage of the ring piece caused by the interference of the tunnel lining body and the shield shell in the tail, for example. The amount of gap in the shield tail gap and grasp its change. In addition, in order to change the forward path at a planned angle when constructing a curved portion, it is important to maintain the gap amount of the shield tail gap within a specific range, and measure the gap amount of the shield tail gap and grasp the change. Therefore, various devices or methods for measuring the gap of the shield tail have been proposed (for example, refer to Patent Documents 1 to 6). Here, the shield tail gap measuring device described in Patent Document 1 measures the amount of movement of the shield tail gap by measuring the amount of movement in the length direction of the metal wire mounted on the spring pushing mechanism arranged so as to abut the ring piece. In the submersible shield machine described in Patent Document 2, the gap amount of the shield tail gap is measured by a non-contact type distance sensor. The shield tail gap measuring device described in Patent Document 3 calculates the gap amount of the shield tail gap based on the distance measured from the distance sensor to the inner peripheral surface of the ring. The shield tail gap measurement device described in Patent Document 4 borrows The distance between the shield tail gap is calculated by the distance between the ultrasonic sensor and the detector in contact with the shield shell. The device for measuring the shield tail gap described in Patent Document 5 uses the distance from the sensor to the inner peripheral surface of the shield case detected by the distance sensor, the distance from the sensor to the inner peripheral surface of the ring, For the calculation of the gap between the shield tail and the thickness of the ring, the shield gap measurement method described in Patent Document 6 is based on the image data captured by a CCD (Charge Couple Device) camera to calculate the shield gap. The amount of clearance. [Prior Art Literature] [Patent Literature] [Patent Literature 1] Japanese Patent Publication No. 6-050036 [Patent Literature 2] Japanese Patent Publication No. 6-102959 [Patent Literature 3] Japanese Patent Publication No. 4-041895 Gazette [Patent Document 4] Japanese Patent No. 2722032 [Patent Document 5] Japanese Patent No. 3229409 [Patent Document 6] Japanese Patent No. 6026974 [Patent Document 7] Japanese Patent Laid-Open No. 2015-45165

In the above-mentioned previous device or method for measuring the gap of the shield tail, due to durability problems, or because it is difficult to accurately measure the gap amount because the gap amount is not directly measured mechanically, the applicant of this case disclosed in Patent Document 7 that The following shield tail gap measuring device and shield shell: the gap amount of the shield tail gap can be continuously and mechanically measured, the change can be easily grasped, and it has considerable durability that can be placed between the tunnel lining body and the shield shell for a long period of time , And can be easily replaced. However, according to the shield tail gap measuring device or the shield case described in Patent Document 7, the contact hand disposed in a state where the side of the shield case is in contact with the outer peripheral surface of the ring piece uses the spring portion as a spring pushing mechanism for measurement. In the middle, it is always pushed in a rotating manner toward the center axis of the shield shell. Therefore, as shown in FIGS. 9 (a) and (b), if the shield shell 52 is advanced relative to the tunnel lining 51, the shield tail is installed. The part of the gap measuring device 50 exceeds the front end of the assembled tunnel lining body 51, and the contact hand 53 protrudes toward the center axis side of the tunnel lining body 51 from the outer peripheral surface of the tunnel lining body 51 due to the force of the spring portion. It may be a hindrance when assembling the next tunnel lining body 51, or there may be damage due to contact with the hand 53 between the tunnel lining body 51 sandwiched at the front end and the next assembled tunnel lining body 51. Therefore, in the previous method, as shown in FIG. 9 (c), the following research was carried out: by making the shield shell 52 advance and stay to the tunnel lining body where the shield tail gap measuring device 50 is installed does not exceed the assembly At the front end of 51, when assembling the next tunnel lining body 51, the contact hand 53 will not protrude toward the central axis side of the tunnel lining body 51 due to the force of the spring portion; however, the shield shell 52 needs to be correspondingly The length of the rear end of the assembled tunnel lining 51 and the shield shell 52 becomes longer because the construction cannot be performed efficiently. If the length at which the rear end of the assembled tunnel lining body 51 and the shield shell 52 overlap becomes longer, obstacles will occur particularly during the construction of sharply curved curved portions. Therefore, it is desirable to shorten the tunnel lining body and shield shell as much as possible. The rear end part overlaps the length. An object of the present invention is to provide a shield tail gap measuring device and a shield shell, which do not touch the hand even if the shield shell advances relative to the tunnel lining body to a front end of the tunnel lining body assembled with the measuring device. It will protrude toward the center axis side of the tunnel lining body than the outer periphery of the tunnel lining body, which will not become an obstacle when assembling the next tunnel lining body, and can effectively suppress the rear end of the assembled tunnel lining body and shield shell The overlapping length becomes longer. The present invention achieves the above-mentioned object by providing a shield tail gap measuring device which measures a shield case held on a submersible shield machine and is composed of a ring piece assembled at the rear of the shield case The amount of gap between the shield tail gap between the outer surface of the tunnel lining body and the structure includes: abutment portion; a rotating shaft portion which is rotatably supported by the abutment portion; and rotation angle sensing A device that detects the rotation angle of the rotating shaft portion; a contact hand portion that is integrated with the rotating shaft portion and extends toward the rear side of the shield shell; and a rotating spring pushing mechanism that makes the contacting hand portion face The center shaft side of the shield case rotates to impart a rotary elastic thrust to the rotary shaft portion; and the rotary elastic thrust mechanism is provided with a reversing mechanism that releases the rotary elastic thrust and rotates the rotary shaft portion in the opposite direction, so that By rotating the rotating shaft portion by rotating the contact hand toward the opposite side of the central axis of the shield case, the contact hand can be stored in the height range of the base portion. In addition, in the shield tail gap measuring device of the present invention, it is preferable that the rotary elastic pushing mechanism is a rotary actuator. In the shield tail gap measuring device of the present invention, it is preferable that the rotary elastic pushing mechanism is a pneumatic rotary actuator. Furthermore, in the shield tail gap measuring device of the present invention, it is preferable that the contact hand portion has an arm shape including a rotating roller contact portion at a front end of the arm body portion. Furthermore, the shield tail gap measuring device of the present invention is preferably provided with an air ejection mechanism that ejects air from the portion of the base portion that houses the contacting hand portion. In addition, the present invention achieves the above-mentioned object by providing a shield case which is equipped with the above-mentioned shield tail gap measuring device and is provided with a rear end portion of a tunnel lining body composed of an assembled ring piece, A mounting recess is formed on the inner peripheral surface, and the shield tail gap measuring device is extended so that the contact hand portion is axially rearward of the shield case, and the base portion does not protrude from the inner peripheral surface of the shield case. The state is fixed to the mounting recess. In addition, in the shield tail gap measuring device of the present invention, it is preferable that the mounting recesses are provided at least three locations at intervals in the circumferential direction of the rear portion, and the shield tail gap measuring devices are fixed to the mounting recesses.

As shown in FIG. 1 to FIG. 3, a shield tail gap measuring device 10 according to a preferred embodiment of the present invention is installed behind the shield shell 12 constituting the outer body of the submersible shield 11 at intervals in the circumferential direction. It is used in at least 3 places (in this embodiment, up, down, left, and right 4 places), and can be rotated by contact with the contact hand 19 that is pushed by the contact with the outer peripheral surface of the tunnel lining body 14 by detection The rotation angle of the shaft portion 17 (see FIGS. 2 and 3) is continuously measured and maintained on the outer peripheral surface of the tunnel lining body 14 formed by assembling the ring piece 13 on the inner side of the rear portion of the shield case 12 and the inner periphery of the shield case 12. Changes in the amount of the gap between the shield tail gaps 15 between the faces. The shield tail gap measuring device 10 of this embodiment has a lightweight and simple structure, is excellent in durability, and can be easily replaced by operations from the inside of the shield shell 12, so it is also excellent in maintainability. In this way, in the long-term shield tunnel project spanning several months to several years, even when the gap between the tunnel lining body 14 and the shield shell 12 is continuously arranged for a long period of time, it can be stabilized. The gap amount of the shield tail gap 15 is continuously measured. In addition, the shield tail gap measuring device 10 of this embodiment has a function of providing a contact hand by a rotary spring pushing mechanism 20 (see FIGS. 4 and 5 (a) and (b)) that rotates the rotating shaft portion 17. The reversing mechanism 20 a (see FIGS. 6 (a) and (b)) of the rotating projectile force of the rotary projectile 19 which releases the contact hand 19 in a direction opposite to the projectile pushing direction, even if the shield case 12 is pushed by pushing the jack 35. With respect to the tunnel lining body 14, the portion where the measuring device 10 is installed exceeds the front end of the assembled tunnel lining body 14, and the contact hand 19 will not face the center of the tunnel lining body 14 from the outer periphery of the tunnel lining body 14. The shaft side protrudes (see FIG. 7 (b)). Therefore, when the next tunnel lining body 14 is assembled using the ring piece 13, the protruding hand 19 does not become an obstacle (see FIG. 7 (c)). Further, as shown in FIGS. 1 to 3, the shield tail gap measuring device 10 of this embodiment measures the shield case 12 held by the submersible shield 11 and the ring piece 13 assembled at the rear of the shield case 12. The device for measuring the gap amount of the shield tail gap 15 between the outer peripheral surface of the tunnel lining body 14 and, as shown in FIGS. 3 to 5 (a) and (b), includes, for example, an abutment portion 16 which can It is housed in a mounting recess 23 formed at the rear of the shield case 12 and preferably has a height smaller than the wall thickness of the shield case 12; a rotating shaft portion 17 is rotatably supported by the base portion 16; Detector 18 (refer to FIGS. 5 (a) and (b)), which detects the rotation angle of the rotating shaft portion 17; contacting the hand portion 19, which is integrated with the rotating shaft portion 17 and extends toward the rear side of the shield case 12 ; And a rotary ejection mechanism 20 (see FIGS. 4 and 5 (a) and (b)), so that the contact hand 19 faces the central axis side of the shield shell 12 (also the upper side of FIG. 3, the tunnel lining body); The center axis side of 14) rotates to impart a rotating elastic thrust to the rotating shaft portion 17. The rotary spring pushing mechanism 20 is provided with a reversing mechanism 20a (see FIGS. 6 (a) and (b)) that can release the rotary spring pushing force and rotate the rotary shaft portion 17 in the opposite direction, and contacts the hand 19 toward the center axis of the shield case 12. On the opposite side (lower side in FIG. 3), the rotating shaft portion 17 is rotated, and the contact hand portion 19 can be stored in the height range of the base portion 16 (see FIG. 7 (b)). In this embodiment, the submersible shield machine 11 is, for example, a soil pressure type submersible shield machine. As shown in FIG. 1, the submersible shield machine 11 has a cylindrical shape with a wall thickness of, for example, about 28 to 50 mm (in this embodiment, 50 mm). The metal outer casing, that is, the front end of the shield shell 12, is provided with a rotary cutter 30, and inside the shield shell 12 is provided with a soil pressure chamber 32 separated by a partition plate 31, a cutter driving device 33, and a screw conveyor. The soil discharging mechanism 34, the pushing jack 35, the mounting device 36 for ring plate assembly, and the like. In addition, the submersible shield 11 uses the mounting device 36 to assemble the tunnel lining body 14 composed of the ring sheet 13. The self-assembled tunnel lining body 14 obtains a reaction force, and uses a pushing jack 35 to connect the rotary cutter 30 and the shield shell 12. Push forward together to cut the digging surface, and excavate the cut soil and sand as dirt through the discharge mechanism 34, while digging the tunnel. Further, in this embodiment, when the submersible shield 11 is advanced, the shield shell 12 can be smoothly moved forward along the outer peripheral surface of the tunnel lining body 14 while the assembled tunnel lining body 14 is retained. In addition, in order to cope with the construction of the curved portion, a shield tail gap 15 is maintained between the outer peripheral surface of the assembled tunnel lining body 14 and the inner peripheral surface of the rear portion of the shield shell 12 covering it. In this embodiment, by using the shield tail gap measuring device 10 to continuously measure the gap amount of the shield tail gap 15 when the submersible shield 11 is advanced and grasp the change, it is possible to prevent, for example, the tail portion of the shield shell 12 (rear End part), the ring lining 13 is deformed or broken due to the interference between the tunnel lining body 14 and the shield shell 12, thereby improving the quality of the tunnel lining body 14. In addition, as shown in FIGS. 3 to 5 (a) and (b), the shield tail gap measuring device 10 of this embodiment is configured to include a base portion 16, a rotating shaft portion 17, a rotation angle sensor 18, and a contact hand.部 19 ， Rotary ejection mechanism 20. In this embodiment, the rotary push mechanism 20 is preferably a pneumatic rotary actuator (see FIG. 6). The base portion 16 includes, for example, a chassis portion 16 a and a pair of bearing wall portions 16 b and 16 b (see FIG. 4), and has a U-shaped cross-sectional shape when viewed from a direction parallel to the central axis of the shield case 12. It has a rectangular planar shape and has a length L1 arranged at a side parallel to the center axis of the shield shell 12 of about 70 mm and a length arranged at a side perpendicular to the center axis of the shield shell 12 L2 is about 40 mm (refer to FIG. 5 (a)). The pair of bearing wall portions 16b and 16b are spaced at an interval of about 10 to 15 mm at the middle portion, and are integrally formed from both sides of the chassis portion 16a. It is arranged, and it is arrange | positioned so that it may extend and arrange in parallel with the center axis of the shield case 12. The height h1 (see FIG. 4) of the base portion 16 from the lower surface of the chassis portion 16 a to the upper end surfaces of the pair of bearing wall portions 16 b and 16 b is, for example, 30 mm. Therefore, the base portion 16 preferably has a height of less than 50, for example. mm The height of the wall thickness of the shield shell. Furthermore, when the height of the base portion 16 of the shield tail gap measuring device 10 is greater than the wall thickness of the shield case 12, for example, the steel plate 23a forming the bottom surface of the mounting recess 23 described later may be directed toward the shield case 12. The outer side is bulged so that the abutment portion 16 does not protrude more inward than the inner peripheral surface of the shield shell 12. The base portion 16 and the rotating shaft portion 17 are rotatably supported on the bearing wall portions 16b and 16b on both sides when a bearing mechanism 16d (see FIG. 5 (b)) is interposed therebetween, and are arranged across the both sides. The bearing wall portions 16 b and 16 b are provided in a state penetrating in a direction perpendicular to the central axis of the shield case 12. The space 16c between the pair of bearing portions 16b and 16b of one of the base portions 16 in the U-shaped cross-section is accommodated when the contact hand 19 described later is rotated toward the opposite side of the center axis side of the shield case 12. The base end portion of the arm body portion 19a of the portion 19 (see FIG. 4). The rotating shaft portion 17 is preferably a metal rod-shaped member having a substantially cylindrical shape. As shown in FIG. 5 (b), the rotating shaft portion 17 includes a central portion enlarged portion 17a having a central portion with an increased diameter, and a diameter smaller than that of the central portion. One of both end portions of the portion 17a is a pair of end reduced-diameter portions 17b. When the rotation shaft portion 17 is mounted on the base portion 16, the central portion enlarged diameter portion 17 a is disposed at the space portion 16 c between the pair of bearing wall portions 16 b and 16 b. The reduced-diameter end portions 17b of the both end portions are respectively disposed in the insertion holes 16e formed in the pair of bearing wall portions 16b and 16b in a state where the bearing mechanism 16d is rotatably supported. In addition, in the central portion enlarged diameter portion 17c of the space portion 16c disposed between the pair of bearing wall portions 16b, 16b of the base portion 16, a circumferential surface engaging hole 17c is formed so as to penetrate in the radial direction. An engaging pin 19b that protrudes integrally from one end of the arm body portion 19a of the contact hand 19 is fixed to the peripheral surface engaging hole 17c by being fitted. Thereby, the contact hand part 19 is integrally joined with the rotating shaft part 17 so that it can rotate together with the rotating shaft part 17. In the reduced diameter portions 17b disposed on both sides of each of the insertion holes 16e formed in the pair of bearing wall portions 16b and 16b, the end surface engaging holes 17f are extended in the axial direction of the rotating shaft portion 17 Settings. The rotation angle sensor 18 can measure the rotation angle of the rotation shaft portion 17 by fixing the sensor shaft 18a of the rotation angle sensor 18 to the end-face engaging hole 17f of the one-end reduced-diameter portion 17b in an embedded manner. By fixing the engaging pin 20b of the rotary ejection mechanism 20 to the end-face engaging hole 17f of the reduced-diameter portion 17b at the other end, the rotary shaft portion 17 can be driven in the forward or reverse direction by the drive of the rotary ejection mechanism 20. Direction rotation. Further, as shown in FIG. 4, each of the pair of bearing wall portions 16 b and 16 b of the base portion 16 is formed with a bearing penetrating in the vertical direction at both end portions in a direction parallel to the central axis of the shield case 12. The wall portions 16b and 16b are fastened with bolts 16f. The shield tail clearance measuring device can be inserted by inserting a bolt member (not shown) into these bolt-fixing fixing holes 16f and tightening the female screw-fastening holes provided in the bottom surface of the mounting recess 23 described later. 10 is detachably fixed to the mounting recess 23. The rotation angle sensor 18 may be a sensor that detects a difference in rotation between a rotating object and a non-rotating object, such as a rotary encoder. In this embodiment, as shown in FIGS. 5 (a) and 5 (b), the rotation angle sensor 18 is covered with a cover body 21 that is integrally mounted with the outer side portion of one of the bearing wall portions 16 b of the base portion 16. And is set by the cover 21 being supported and protected. The rotation angle sensor 18 can measure the rotation angle of the rotation shaft portion 17 by fitting the sensor shaft 18 a into the end-face engaging hole 17 f of the one-end reduced-diameter portion 17 b of the rotation shaft portion 17 as described above. The waterproof connector 21a is provided on the cover body 21 so as to protrude outward. The sensor cable 22 (refer to FIG. 2) extending along the inner side surface of the shield case 12 may be connected to the rotation angle sensor 18 by being introduced into the cover 21 through the waterproof connector 21 a. Thereby, signals such as angle information detected by the rotation angle sensor 18 are extracted via the sensor cable 22 to, for example, an on-board sequencer disk provided inside the submersible shield 11. In this embodiment, as shown in FIGS. 4 and 5 (a) and (b), the contact hand portion 19 has an arm shape including a pair of rotating roller contact portions 19c at the front end of the arm body portion 19a. The arm body portion 19a of the hand 19 is, for example, It is formed by a steel rod-shaped member having a thickness of about 12 mm and a length of about 120 mm, and has an engaging pin 19b at one end portion that is slightly reduced in diameter than the arm body portion 19a. As described above, the engaging pin 19b is fitted into the peripheral surface engaging hole 17c formed in the space portion 16c between the pair of bearing wall portions 16b, 16b of the base portion 16 formed in the central portion enlarged diameter portion 17a of the rotating shaft portion 17, And, for example, it is integrally fixed to the enlarged diameter portion 17a of the central portion via a fixing pin, whereby the contact hand portion 19 can be rotated in the forward or reverse direction along with the rotation of the rotation shaft portion 17. A notch surface 19d is formed at the other end of the arm body portion 19a on the opposite side to the engaging pin 19b. The notch surface 19d is chamfered in parallel on both sides, and is rotated to penetrate the notch surfaces 19d on both sides. The support shaft 19e is provided in a state protruding toward both sides. A pair of rotating roller contact portions 19c are rotatably supported on a rotation supporting shaft 19e of a portion protruding from both sides of the notch surface 19d via a bearing mechanism or the like, and are provided on both sides of the other end portion across the arm body portion 19a. As the rotating roller contact portion 19c, for example, an outer diameter larger than the outer diameter of the arm body portion 19a is used. It is formed by a steel sleeve member with a thickness of about 20 mm. The rotation roller contact portion 19c can be rotated by the rotation support shaft 19e by mounting the rotation support shaft 19e on a portion protruding toward both sides of the notch surface 19d with a bearing mechanism composed of a plurality of balls. Rotate it. The rotating roller contact portion 19c can rotate when contacted with the outer peripheral surface of the tunnel lining body 14 constituted by the ring piece 13 due to the rotating force of the rotating elastic pushing mechanism 20 which is pushed by the contacting hand portion 19, so that the rotating roller contact portion 19c can be rotated even more. The smooth and stable state causes the contact hand 19 to move along the outer peripheral surface of the tunnel lining body 14 toward the axial direction of the shield shell 12. In the present embodiment, as described above, it is preferable that the rotary push mechanism 20 uses, for example, a pneumatic rotary actuator as the rotary actuator. The rotary actuator is known as a device capable of adjusting the swing angle. For example, a hydraulic rotary actuator or an electric rotary actuator may be used. The pneumatic rotary actuator is an actuator that uses air pressure as a driving source. For example, a single-blade type actuator has a structure as shown in FIGS. 6 (a) and (b). The ejection mechanism 20 of the pneumatic rotary actuator shown in Figs. 6 (a) and (b) is composed of: a body 40; a blade 41 which slides on the inner surface of the body 40; a rotation shaft 42 which is connected with the blade 41 Integrated; stopper 43; and reversing mechanism 20a, including port A and port B serving as air supply ports, as shown in FIG. 6 (a), when air is supplied from port A, the blade 41 is pressed against The rotating shaft 42 generates a torque, and the air in the exhaust side chamber is exhausted through the B port, and can rotate in a clockwise direction before the blade 41 hits the stopper 43 and stops, for example. When the air is supplied from the B port, as shown in FIG. 6 (b), it can be similarly rotated in the counterclockwise direction. Therefore, in this embodiment, when the change in the gap amount of the shield tail gap 15 between the outer peripheral surface of the tunnel lining body 14 formed by the assembly ring piece 13 and the inner peripheral surface of the shield case 12 is continuously measured, for example, Air is supplied from the A port to generate torque on the rotating shaft 42, so that a rotating elastic thrust can be given to the rotating shaft portion 17 through the joint pin 20 b connected to the rotating shaft 42, so that the contact hand portion 19 faces the center axis side of the shield case 12. Rotate (see Figure 3 and Figure 7 (a)). When the shield shell 12 is advanced relative to the tunnel lining body 14 to the front end of the assembled tunnel lining body 14 where the measuring device 10 is installed, for example, the reversing mechanism 20a is activated by supplying air from the B port, By releasing the thrust force of the rotating spring via the rotating shaft 42 and the rotating shaft portion 17 of the engaging pin 20b, the rotating shaft portion 17 is rotated so that the contact hand portion 19 is rotated toward the opposite side of the center axis of the shield case 12, thereby enabling the rotating shaft portion 17 to be rotated. The contact hand part 19 is accommodated in the height range of the base part 16 (refer FIG.7 (b), (c)). Moreover, in this embodiment, a pair of piping ports 20c are provided so as to protrude so that it may protrude from an outer peripheral surface to the pneumatic rotary actuator which is the rotary ejection mechanism 20 (refer FIG. 4). Each of the piping ports 20c is continuous with the A port and the B port inside the body 40 for supplying air to the pneumatic rotary actuator 20. Since each of the piping ports 20c is connected to the air supply piping 24 (refer to FIG. 5 (a)) extending along the inner side of the shield case 12, the ports A and B can be switched to the air supply port, and the air can be pressure-fed. It is supplied to the inside of the body 40. Further, in this embodiment, as shown in FIG. 8, the space between the pair of bearing wall portions 16 b and 16 b of the base portion 16 which is a portion of the U-shaped cross section of the base portion 16 that is in contact with the hand portion 19 is received. The portion 16c is provided on the upper surface of the chassis portion 16a, and an air ejection hole 25 for ejecting air from the upper surface of the chassis portion 16a is provided as an air ejection mechanism in a state communicating with the air supply sleeve 26 (see FIG. 4). The air sent from the air supply sleeve 26 is preferably continuously ejected from the air ejection hole 25 at all times, so that it is possible to prevent the accumulation of dirt, sand, or backfill material on the part that receives the contact with the hand 19, or the invasion of foreign matter. This can effectively prevent the base end portion of the arm body portion 19a of the contact hand portion 19 from being held in the spacer portion 16c when the contact hand portion 19 is rotated toward the opposite side of the center axis side of the shield case 12, and cannot be prevented. The contact hand portion 19 is stored in the height range of the base portion 16. In this embodiment, the shield tail gap measuring device 10 having the above-mentioned structure is used by being mounted on the mounting recess 23 in various fixed states (refer to FIGS. 1 to 3). The rear portion of the tunnel lining body 14 composed of the assembled ring pieces 13 is provided at four positions, for example, up, down, left, and right, at equal angular intervals of 90 degrees in the circumferential direction. That is, in this embodiment, as shown in FIG. 2 and FIG. 3, at the rear portion of the shield case 12, the mounting recess 23 that can accommodate the entire shield tail gap measuring device 10 can be closed by welding the steel plate 23 a. It is formed in the peripheral surface side part outside the through-opening of the shield case 12, and it is formed in four places of upper, lower, left, and right. The shield tail gap measuring device 10 is provided in a state where the contact hand 19 is extended toward the axially rear side of the shield case 12, and the base portion 16 on which the cover body 21 or the rotary push mechanism 20 is integrally mounted is not removed from the shield case. A state in which the inner peripheral surface of 12 protrudes is fixed to the mounting recesses 23. The shield tail gap measuring device 10 can be formed by, for example, inserting and fastening a bolt member (not shown) through a female screw fastening hole formed at a specific position of the steel plate 23 a that becomes the bottom surface of the mounting recess 23. Bolts are fastened to the bearing wall portions 16 b and 16 b of one of the base portions 16 and fixed to the mounting recesses 23 so that they can be detached and replaced. Moreover, in this embodiment, the inner side surface of the shield case 12 is cut and formed to extend from the mounting recesses 23 at four locations toward the axially forward side of the shield case 12, respectively, and is used to arrange a sensor cable. The grooves 27 of the wire 22 or the air supply pipe 24 and the like. As the sensor cable 22 is laid in the groove 27, the rotation angle sensor 18 of the shield tail gap measuring device 10 installed in the mounting recess 23 and the internal sequencer disk provided inside the shield machine 11 are installed, for example. connection. The air supply piping 24 or the like is laid in the groove 27, so that, for example, compressed air delivered from the compressor can be supplied to the rotary spring mechanism 20 of the air compression rotary actuator, or air can be supplied from the air through the air supply sleeve 26. The ejection hole 25 ejects. As described above, the shield tail gap measuring device 10 fixed to the mounting recess 23 is assembled with a tunnel lining body 14 composed of a ring sheet 13 on the inside of the rear portion of the shield shell 12 as shown in FIGS. 2 and 3. The force of the rotating spring pushing mechanism 20 of the device will be in a state where the rotating roller contact portion 19c contacting the hand portion 19 is always in contact with the outer peripheral surface of the tunnel lining body 14 from the rear side of the shield case 12, so the rotation angle sensor can be used. 18 makes it easy to detect a change in the rotation angle of the rotating shaft portion 17 to which the hand 19 is engaged due to a change in the gap amount of the shield tail gap. In addition, the shield tail gap measuring device 10 fixed to the mounting recess 23 can continuously measure the gap amount of the shield tail gap 15 and easily grasp the change, and is provided between the tunnel lining body 14 and the shield shell 12 for a long period of time. It is quite durable and can be easily replaced. In addition, according to the shield tail gap measuring device 10 and the shield shell 12 of the present embodiment having the above configuration, even if the shield shell 12 advances relative to the tunnel lining body 14 to a portion where the measuring device 10 is installed exceeds the assembled tunnel lining body 14 At the front end, the contact hand 19 will not protrude toward the central axis side of the shield shell 12 from the outer peripheral surface of the tunnel lining body 14, which will not become an obstacle when assembling the next tunnel lining body 14, and can effectively inhibit assembly. The length of the overlapping portion of the tunnel lining body 14 and the rear end of the shield shell 12 becomes longer. That is, according to this embodiment, the shield tail gap measuring device 10 is configured to include: a base portion 16 having a height smaller than the wall thickness of the shield case 12; and a rotating shaft portion 17 which is rotatably supported by the base portion 16. The state setting; a rotation angle sensor 18 that detects the rotation angle of the rotation shaft portion 17; a contact hand portion 19 that is integrated with the rotation shaft portion 17 and extends toward the rear side of the shield case 12; and a rotary spring push A mechanism 20 that imparts a rotary spring thrust to the rotary shaft portion 17 so that the contact hand 19 rotates toward the center axis side of the shield case 12; the rotary spring push mechanism 20 is provided with a rotary spring thrust 17 that can release the rotary spring thrust The reversing mechanism 20 a rotating in the opposite direction rotates the rotating shaft portion 17 so that the contacting hand portion 19 rotates toward the opposite side of the center axis of the shield case 12, and the contacting hand portion 19 can be stored in the height range of the base portion 16. Therefore, in this embodiment, after assembling the tunnel lining body 14 composed of the ring sheet 13 on the inner side of the rear portion of the shield case 12, as shown in FIG. 7 (a), the contact force is maintained by the force of the rotary spring pushing mechanism 20 The rotating roller contact portion 19c of the portion 19 is always in contact with the outer peripheral surface of the tunnel lining body 14 from the rear side of the shield shell 12, so it is easy to detect the contact caused by the change in the gap amount of the shield tail gap 15 By changing the rotation angle of the rotating shaft portion 17 of the hand portion 19, it is possible to easily continuously measure the change in the gap amount of the shield tail gap. Further, when the pushing jack 35 is extended to advance the shield shell 12 relative to the tunnel lining body 14, as shown in FIG. 7 (b), for example, before the pushing jack 35 is fully extended, the reversing mechanism 20a is preferably automatically The method of switching the air supply port from the A port to the B port controls the rotary ejection mechanism 20 in conjunction with the elongation of the propulsion jack 35 (see FIGS. 6 (a), (b)). By this, before the part on which the measuring device 10 is installed exceeds the front end of the assembled tunnel lining body 14, the rotary spring pushing mechanism 20 releases the rotary spring thrust and rotates with the contact hand 19 toward the opposite side of the center axis of the shield shell 12. When the rotating shaft portion 17 is rotated, the contact hand portion 19 can be stored in the height range of the base portion 16. Furthermore, as shown in FIG. 7 (c), even if the pushing jack 35 is fully extended, the shield shell 12 advances relative to the tunnel lining body 14 to a portion where the measuring device 10 is installed exceeds the assembled tunnel lining body 14. At the front end, it can also be achieved that the contact with the hand 19 does not protrude toward the central axis side of the shield shell 12 from the outer peripheral surface of the tunnel lining body 14, and does not become an obstacle when assembling the next tunnel lining body 14 through the ring sheet 13. The length of the overlap of the assembled tunnel lining body 14 and the rear end portion of the shield shell 12 is effectively suppressed. Furthermore, during the operation of assembling the next tunnel lining body 14 using the ring sheet 13, the detection of the rotation angle of the rotating shaft portion 17 is interrupted, and after the assembly of the next tunnel lining body 14 is completed, for example, the measurement preparation of the control device is pressed. Complete the button to switch the air supply port to port A. As shown in Fig. 7 (d), the rotating roller contact portion 19c of the contact hand 19 contacts the outer peripheral surface of the tunnel lining body 14 from the rear side of the shield shell 12 , The detection of the rotation angle of the rotating shaft portion 17 is restarted, the propulsion jack 35 is extended, and the drilling operation of the submersible shield machine 11 is restarted. It should be noted that the present invention is not limited to the above-mentioned embodiment and can be modified in various ways. For example, the rotary push mechanism is not necessarily a rotary actuator such as a pneumatic rotary actuator, and other known rotary push mechanisms including a reversing mechanism that releases the rotary push force and rotates the rotary shaft portion in the opposite direction may be used. In addition, the contact hand does not necessarily have the shape of an arm having a rotating roller contact portion at the front end of the main body portion, and various other contact hands may be used. Furthermore, it is not always necessary to provide an air ejection mechanism that ejects air from the portion of the base portion that is in contact with the hand. For example, a membrane mechanism may also be provided between the part of the abutment part that stores the contact with the hand and the contact with the hand, so that no dirt, sand, or backfill material accumulates, or foreign matter intrudes. [Industrial Applicability] According to the shield tail gap measuring device or shield shell of the present invention, even if the shield shell advances relative to the tunnel lining body to a point where the measuring device is installed beyond the front end of the assembled tunnel lining body, touch the hand It will not protrude toward the center axis side of the tunnel lining body from the outer periphery of the tunnel lining body, which will not become an obstacle when assembling the next tunnel lining body, and can effectively suppress the assembled tunnel lining body and shield shell The overlapping length of the rear end portions becomes longer.

10‧‧‧Shield tail gap measuring device

11‧‧‧ Submersible Shield

12‧‧‧Shield Shell

13‧‧‧ ring

14‧‧‧ Tunnel Lining

15‧‧‧shield tail gap

16‧‧‧ Abutment Department

16a‧‧‧Chassis

16b‧‧‧bearing wall

16c‧‧‧Interval

16d‧‧‧bearing mechanism

16e‧‧‧Plug-in hole

16f‧‧‧Bolt fastening fixing hole

17‧‧‧rotating shaft

17a‧‧‧Central part

17b‧‧‧End Reduction

17c‧‧‧Central part

17f‧‧‧face joint hole

18‧‧‧rotation angle sensor

18a‧‧‧Sensor shaft

19‧‧‧ touch your hand

19a‧‧‧arm body

19b‧‧‧Joint Pin

19c‧‧‧Rotating roller contact

19d‧‧‧ notched surface

19e‧‧‧rotation support shaft

20‧‧‧Rotary spring push mechanism

20a‧‧‧ Reversal mechanism

20b‧‧‧Joint Pin

20c‧‧‧Pipe port

21‧‧‧ Cover

21a‧‧‧ Waterproof connector

22‧‧‧ sensor cable

23‧‧‧Mounting recess

23a‧‧‧steel plate

24‧‧‧Air supply piping

25‧‧‧air ejection hole

26‧‧‧Air supply sleeve

27‧‧‧ groove

30‧‧‧Rotary cutter

31‧‧‧ bulkhead

32‧‧‧Soil pressure chamber

33‧‧‧ Cutter driving device

34‧‧‧Soil discharge agency

35‧‧‧advancing the jack

36‧‧‧Installation device

40‧‧‧ Ontology

41‧‧‧ Blade

42‧‧‧Rotary shaft

43‧‧‧stop

50‧‧‧shield tail gap measuring device

52‧‧‧Shield Shell

51‧‧‧ Tunnel Lining

53‧‧‧ touch your hand

A‧‧‧Part

A‧‧‧Port

B‧‧‧Port

h1‧‧‧ height

L1‧‧‧ length

L2‧‧‧ length

FIG. 1 is a schematic cross-sectional view illustrating a configuration of a submersible shield machine equipped with a shield tail gap measuring device according to a preferred embodiment of the present invention. FIG. 2 is a schematic cross-sectional view illustrating a main part of a shield case equipped with a shield tail gap measuring device according to a preferred embodiment of the present invention. FIG. 3 is a schematic enlarged view of part A of FIG. 2. FIG. 4 is a perspective view of a shield tail gap measuring device according to a preferred embodiment of the present invention. Fig. 5 (a) is a top view of the shield tail gap measuring device, and (b) is a sectional view along B-B of (a). 6 (a) and 6 (b) are schematic cross-sectional views illustrating a reversing mechanism of a pneumatic rotary actuator. Fig. 7 (a) is an explanatory diagram of a state in which the contact hand is pushed and rotated toward the center axis side of the shield case to detect the rotation angle, and (b) is the contact hand portion toward the opposite side of the center axis of the shield case An explanatory diagram of the height range of the base part that is rotated and stored, (c) is an explanatory diagram of the state of assembling the next ring piece, and (d) is the contact with the hand to rotate toward the center axis side of the shield shell This is an explanatory diagram of a state in which the rotation angle is once again pushed and detected. FIG. 8 is an explanatory diagram of an air ejection mechanism that ejects air from a part of the base portion that contacts the hand. Figs. 9 (a) to (c) are schematic cross-sectional views of main parts illustrating the defective condition of the conventional shield tail gap measuring device.

Claims (7)

A shield tail gap measuring device, which measures the gap between the shield shell held by the submersible shield machine and the shield tail gap between the outer peripheral surface of the tunnel lining body composed of a ring assembled at the rear of the shield shell, And its structure includes: a base part; a rotating shaft part that is rotatably supported by the base part; a rotation angle sensor that detects the rotation angle of the rotating shaft part; It is integrally connected with the rotating shaft portion and extends toward the rear side of the shield case; and a rotary spring pushing mechanism is provided to the rotating shaft portion so that the contact hand portion rotates toward the center axis side of the shield case. Rotary spring thrust; and the rotary spring thrust mechanism is provided with a reversing mechanism that releases the rotary spring thrust to rotate the rotary shaft portion in the opposite direction, and rotates the contact hand toward the opposite side of the center axis of the shield case By rotating the rotation shaft portion, the contact hand portion can be stored in a height range of the base portion. The shield tail gap measuring device according to claim 1, wherein the rotary spring pushing mechanism is a rotary actuator. For example, the shield tail gap measuring device of claim 2, wherein the rotary elastic pushing mechanism is a pneumatic rotary actuator. The shield tail gap measuring device according to claim 1, wherein the contact hand portion has an arm shape having a rotating roller contact portion at the front end of the arm body portion. For example, the shield tail gap measuring device of claim 1 is provided with an air ejection mechanism that ejects air from the part of the base part that receives the contact with the hand. A shield case is provided with a shield tail gap measuring device as claimed in claim 1, and a rear end portion of a tunnel lining body composed of an assembled ring piece is provided with a mounting recess on an inner peripheral surface thereof. The gap measuring device is fixed to the mounting recess in a state where the contact hand portion extends toward the axially rear side of the shield case and the base portion does not protrude from the inner peripheral surface of the shield case. For example, the shield case of claim 6, wherein the mounting recesses are provided at least three locations at intervals in the rear circumferential direction, and the shield tail gap measuring device is fixed to each of the mounting recesses.